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Browser Extensions · head to head

Greasemonkey vs Grype

Greasemonkey logo

Greasemonkey

Browser Extensions

The original userscript manager, for Firefox

From
Free
Rated
-
Full reviewWebsite
Grype logo

Grype

Cybersecurity

Vulnerability scanner for container images and filesystems

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Greasemonkey firefox only. There is no Chrome, Edge or Safari build and there never has been.; Grype depends on public vulnerability databases, so coverage and false positives vary by ecosystem
  • They diverge on capability: Greasemonkey covers Userscript execution, Grype covers Image and filesystem scanning.
  • Prices and features above were last checked on 17 September 2026.

Where they differ

Only the attributes on which Greasemonkey and Grype actually diverge.

Attributes where Greasemonkey and Grype differ
AttributeGreasemonkeyGrype
Pricing modelopen-sourceOpen source, no licence fee
PlatformsFirefoxLinux, macOS, Windows, Docker
CategoryBrowser ExtensionsCybersecurity

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Greasemonkey

  • Userscript execution
  • Built-in script editor
  • GM. API
  • @resource support
  • Script localisation
  • Firefox for Android

Only in Grype

  • Image and filesystem scanning
  • SBOM-driven
  • Wide ecosystem coverage
  • Pipeline friendly

What people use each for

The jobs each tool is most often brought in to do.

Greasemonkey

  • Restyling or de-cluttering a site you use dailynot Grype
  • Automating a repetitive action on a web applicationnot Grype
  • Adding a missing feature to a site you do not controlnot Grype
  • Running userscripts on Firefox for Androidnot Grype
  • Writing and testing your own scripts in the browsernot Grype

Grype

  • Re-scanning stored SBOMs as new CVEs are published, without rebuilding imagesnot Greasemonkey
  • Failing CI when a build introduces a known vulnerabilitynot Greasemonkey
  • Auditing what is actually installed inside a third-party imagenot Greasemonkey

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Greasemonkey

  • Firefox only. There is no Chrome, Edge or Safari build and there never has been.
  • Its API diverged from the Tampermonkey conventions most shared scripts are written against, so a script from a sharing site may need adjusting to run.
  • The dashboard is plainer than Tampermonkey's, with no diff view when a script updates itself.
  • No cloud sync of the kind Tampermonkey and Violentmonkey offer; moving machines means exporting.
  • A userscript manager can read and rewrite every page you visit, so the security of the arrangement depends entirely on the scripts you choose to install.

Grype

  • Depends on public vulnerability databases, so coverage and false positives vary by ecosystem
  • No triage, exception tracking or reporting UI — that is Anchore’s commercial product
  • Overlaps heavily with Trivy, and most teams pick one rather than running both

Pricing, plan by plan

Greasemonkey

Free
  • Open sourceFree
    • Unlimited scripts
    • Built-in editor
    • No account required

Grype

Free
  • GrypeFree
    • Full functionality
    • No usage limits
    • Community support

Which should you pick?

Choose Greasemonkey if

  • You need userscript execution.
  • You want to start without paying.
  • You work on Firefox.
  • You also want built-in script editor.
Greasemonkey review

Choose Grype if

  • You need image and filesystem scanning.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker.
  • You also want sbom-driven.
Grype review

Questions people ask

Is Greasemonkey or Grype better?
Neither clearly leads. Greasemonkey starts at Free and Grype at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Greasemonkey or Grype?
Greasemonkey starts at Free and Grype at Free.
Does Greasemonkey or Grype run on more platforms?
Greasemonkey runs on Firefox. Grype runs on Linux, macOS, Windows, Docker.
Can I use Greasemonkey for free?
Both have a free tier, so you can try either at no cost before committing.
What is Greasemonkey best used for?
Greasemonkey is most often used for restyling or de-cluttering a site you use daily, automating a repetitive action on a web application, adding a missing feature to a site you do not control, running userscripts on firefox for android. Of those, restyling or de-cluttering a site you use daily and automating a repetitive action on a web application are not what Grype is typically brought in for.
What can Greasemonkey do that Grype cannot?
Greasemonkey covers Userscript execution, Built-in script editor, GM. API, @resource support. Grype covers Image and filesystem scanning, SBOM-driven, Wide ecosystem coverage, Pipeline friendly.

Answered from the vendors’ own pages

Greasemonkey: Is Greasemonkey still maintained?

Yes. Version 4.14 was released on 2 June 2026, and the project has an active repository, bug tracker and discussion groups.

Source
Grype: Is Grype free?

Yes, open source from Anchore. Anchore Enterprise is the paid platform around it.

Greasemonkey: Does Greasemonkey work on Chrome?

No. It is a Firefox extension and has never shipped for Chrome. Violentmonkey and Tampermonkey are the equivalents there.

Source
Grype: What is the difference between Grype and Syft?

Syft generates the software bill of materials; Grype matches that inventory against vulnerability data. They are designed to be used together.

Greasemonkey: Will Tampermonkey scripts run in Greasemonkey?

Often, but not always. Greasemonkey's API diverged from the conventions most shared scripts are written against, so a script may need its header or its GM calls adjusted.

Source
Grype: Grype or Trivy?

They cover similar ground. Trivy is broader out of the box, including misconfiguration and secret scanning; Grype pairs more cleanly with an SBOM-first workflow.

Greasemonkey: Does Greasemonkey run on mobile?

On Firefox for Android, from version 4.12. There is no iOS build, because Firefox on iOS cannot load extensions of this kind.

Source
Greasemonkey: What is the GM API?

The set of functions a userscript manager exposes to scripts, named after Greasemonkey, which defined it. Greasemonkey supports the promise-based GM. form including GM.xmlHttpRequest and GM.registerMenuCommand.

Source
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